INT 10 - VIDEO - READ CHARACTER AND ATTRIBUTE AT CURSOR POSITION
        AH = 08h
        BH = page number (00h to number of pages - 1) (see AH=00h)
Return: AH = charater's attribute (see below)
        AL = character
Notes:  for monochrome displays, a foreground of 1 with background 0 is
          underlined
        the blink bit may be reprogrammed to enable intense background colors
          using AX=1003h or by programming the CRT controller
        the foreground intensity bit (3) can be programmed to switch between
          character sets A and B on EGA and VGA cards, thus enabling 512
          simultaneous characters on screen.  In this case the bit's usual
          function (intensity) is regularly turned off.
SeeAlso: AH=09h,AX=1003h,AX=5001h

Bitfields for character's attribute:
 bit 7  blink
 bits 6-4  background color
                000 black       100 red
                001 blue        101 magenta
                010 green       110 brown
                011 cyan        111 white
 bits 3-0  foreground color
                0000 black       1000 dark gray
                0001 blue        1001 light blue
                0010 green       1010 light green
                0011 cyan        1011 light cyan
                0100 red         1100 light red
                0101 magenta     1101 light magenta
                0110 brown       1110 yellow
                0111 light gray  1111 white

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